rolf j



(No Model.) 7

R. J. ROLFSON.

GARBURBTOR.

Patented May 30 UNITED STATES PATENT OFFICE.

ROLF J. ROLFSON, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR TO THE UNION GAS ENGINE COMPANY, OF SAME PLACE.

CARBURETOR.

SPECIFICATION formingpart of Letters Patent No. 498,447, dated May 30, 1893. Application filed December 22, 1892. Serial No. 456,050. (No model- To in whom it may concern:

Be it known that I, ROLF .T. ROLFSON, a citizen of the United States, residing at San Francisco, in the county of San Francisco and State of California, have invented certain new and useful Improvements in Carburetors; and Ido herebydeelare the following to be a full, clear, and exact description of said invention, such as will enable others skilled in the art to which it most nearly appertains to make, use, and practice the same.

This invention relates to a certain new and useful carburetor for attachment to gas engines, which consists in the arrangement of parts and details of construction as will be hereinafter more fully set forth in the drawings, described and pointed out in the specification.

The main object of my invention is to provide a device which shall be secured direct to the engine itself and form a part thereof, for the purpose of vaporizing the volatile oil fed therein, for the running of the engine, and in this manner permit the users of gas engines to dispense with the necessity of making employment of the well known carburetors for the generation of the explosive compound for the engine, the use of which carburetors being open to the serious objection that owing to the quantity of volatile liquid necessarily contained therein for generation of the explosive gas, greatdanger is liable to follow a back explosion from the engine.

A further object of my invention is to provide a device which, when the speed of the engine is increased or decreased, will automatically control the supply of explosive gas to the engine and that of the volatile oil from the reservoir to the carburetor, and to close the supply passage for the volatile oil in case of a back explosion from the engine occurring, in order to prevent the ignition of oil contained within the reservoir, which would follow in case no automatic check were provided for the supply pipe.

Referring to the drawings forming a part of this application, wherein similar letters of reference are used to denote corresponding parts throughout the entire specification and several views- Figure 1,is aside elevation of a gas engine, showing my attachment secured thereto; Fig. 2, an enlarged vertical sectional view of the carburetor; Fig. 3, detail side elevation of the carburetor; and Fig. 4, cross sectional top plan view, taken on line (t -w, Fig. 2.

The letter A, indicates an ordinary gas engine, provided with the usual exhaust pipe A, for outlet of hot products of combustion and inlet pipe A for admission of explosive gas to the engine, while B, is the operating rod for controlling exhaust valve, which is raised and lowered through the medium of any suitable cam secured upon shaft B. These parts being well known in the making and working of all gas engines call for no specific description, more especially as they form no portion of my present invention.

The carburetor consists of the casing C, which is preferably constructed of glass, open at both ends, which is closed by means of metallic top and bottom plates 0, 0 each of which has a circular seat a, cut in the face thereof and into which ends of casing C, fit as shown, and the two plates are secured to- .gether and easing forced to snugly fit within seat ct, by means of screw bolts D. The bottom plate 0 is cast with two downwardly extending pipes D, D which pipes join at their bottom and terminate in the outwardly projecting pipe D The pipes D, D serve to convey the explosive gas from the vaporizing chamber E, as generated therein as hereinafter set forth, to pipe D from whence it is fed to the combustion chamber of the engine through the medium of inlet pipe A which is connected to outlet pipe D as shown. The pipes D, D are connected at their top by means of bridge E, which-is provided with the central air passageway E which is intersected by means of air inlet or supply pipe E. This pipe may be cast integral with bottom plate or be formed separate. When formed integral-it may be said to constitute a continuation of the hollow bridge, or the bridge may be cast separate from the bottom plate and made in the form of a pipe. I prefer, owing to cheapness, to cast the parts integral. Into the upper end of hollow bridge or pipe E, which extends through bottom plate, as shown, is secured lower end of shell E, which extends upwardly within'the vaporizing chamber E. This shell is surrounded by a loose sleeve F, Fig. 2, which supports a perforated screen e. In the device shown I make employment of a set of three screens '6, 6, 6 the screen 6, being separated from screen 6, by washer d, and screen e, from 8 by washer cl, while the upper or top screen 6 is held in place and united to shell E, by' means of collar 61 This collar is soldered or otherwise secured to the shell and thus prevents the disarrangement of the screens during handling of the device.

Into and through the bottom of hollowconnecting bridge E, is secured a downwardlyextending sleeve F, which sleeve is internally screw threaded and into which is fastened an upwardly projecting hollow guide- F which guide extends within shell- E as shown inFig. 2. Through this guide works valve stemf, the upper end of which is. connectedto a dome-shaped valve F which closes the hollow shell E The lower end of the valve stem is screwed into seat f, formed in sleeve f which is located within passage way for the explosive gas, and projects through openingformed in pipe wallf The lower end of said sleeve is provided with an en larged head g, which closes the air vent g, which extends through-wall The admission-of air through this vent is controlled by meansof slide Ga Upon the lower screw-threaded portion of the'valve stem f, is secured the regulating collarG, which by being adjusted up or down onthe screw-threaded lower portion of the valve stem, serves to regulate the lift of -thedome'shaped valve and the inlet of volatile oil within the carburetor, as hereinafter willmore fully appear.

The'top plate'O', of the carburetor, is provided'with a central opening h, whichis surrounded by an annular internally screwthreaded flange H. Into this flange is fitted an externally screw-threaded hollow plug H,

which is closed at its lower end, and through the lower end is drilled a tapering opening h. WVithin the hollow portion of the'plug, is fitted a tapering valve H which moves up and down through the opening it, the taper of which corresponds with that of the valve. The taper or inclination of this valve, and valve openin g, is cut to a mathematical scale, sothat as the valve is raised, by the lift of the dome-shaped valve, only such a quantity of volatileoil is permitted to flow through opening h, as will serve to generate a certain power, that is to say, that if the lift of the dome-shaped valve is regulated so as to raise the oil to vaporize.

makes its escape from said chamber intopipes The hollow portion treme lift of the valve, a central perforated collar H which prevents the valve moving beyond a certain distance. In case of a back explosion the valve H will be forced upward until the top thereof bears against the central opening of the collar and closes or cuts olf the oil passage, consequently preventing ignition of the inflammable oil.

The plug H, is formed with an enlarged hollow-head h and within the hollow portion is located a screen I, which is held in proper position by means of a screw-threaded cap 1 This cap is formed with a central opening, and the upper end of the cap is reduced so 'as to-permit supply pipe 1 fitting thereover.

This pipe may be of rubber or any other suitable material, and serves the purpose of convey-ing the volatile oil from the reservoir,

which may be located at any convenient point, not shown, to the oil passage.

The exhaust pipe A, of the engine ispartly enlarged into the casing 1 and into same extends the fresh air pipe J,which circulates therein and passes therefrom downwardly As the freshand-connects with inlet pipe E air enters this pipe, it circulates within the same and is heated by the raised temperature of the casing, caused by the hot products of combustion from theengine beingretained therein, and when discharged into pipe E is extremely hot. This hot air paSseSint-o the hollow bridge or pipe and from there enters the hollow shell E and the suction from the engine, through pipes A D D and D causes the hot air to raise the'dome-shaped valvein order to admit the hotair into the vaporizing chamber. As the hot air strikes the .under face of the valve, the surface of same is raised to an extreme degree of heat, and as same'is lifted it contactswith lower end of valve H and raises same so as to permit the escape of oil through passage wayh, which as it escapes into vaporizingchamber falls upon the heated surface of the dome-shaped-valve, the heat of which and the retained hot air causes As the carbpreted air D, and D it passes through the openings of the heated screens e, e, 6 which not only serve to-extract all moistures therefrom, but also effect the separation ofany and allpar-= ticles. The dome-shaped valve is forceddown uponits seat through the medium of the spring j, which surrounds the valve stem sleeve f which springis compressed during the uplift of the valve. This sleeveis raised or lowered so as to open or close the air Vent g.

The outer face of sleeve F, is provided with worm threads j, and upon same works the worm collar J. This collar is provided with an outwardly extending handle J As this handleis turned to either the right or left, the worm collar is caused to move upor down, and as thus moved serves tolengthen orshorten the lift of the valve stem, owingrto the fact that regulating collar contacts therewith. By.

. 498,447 g I I a connecting the handle J with the engine governor, the same may be thrown in or out automatical] y by the increased or decreased speed of the engine. In case the gas flowing from the vaporizing chamber does not contain suflicient oxygen, the same maybe supplied thereto by opening the vent slide G.

I do not confine myself to the exact details of construction shown in the drawings as many minor changes may be made therein without departing from the invention.

Having thus described my invention, what I claim as new, and desire to secure protection in by Letters Patent of the United States, is-

1. In a carburetor, the combination with the,

carbureting chamber, of a tapered guide passage for the volatile 011 leading into said chamber, a tapered valve mounted in said guide passage and held therein by gravity, an air inlet, an exit for the carbureted air, and a valve controlling the flow through the'air inlet and constructed to actuate the valve in the guide passage and thereby regulate the supply of volatile oil.

2. In a carburetor, the combination with the carbureting chamber, of a hollow plug secured in the top of the same and having a downwardly tapered opening in its lower end and a tapered valve mounted loosely in the plug and resting normally in said opening.

3. In a carburetor, the combination with the carburetin gchamber provided with an oil inlet and an outlet for the explosive gas, of an air inlet shell or tube arranged within the said chamher, a valve to open and close said shell, a valve stem guide, a stem secured to the valve and extending through the said guide, and a spring acting on said stem to close the valve 4. In a carburetor, the combination with the carbureting chamber provided with an oil inlet and an outlet for the explosive gas, of an air inlet, a valve to open and close the air inlet, avalve stem guide, a stein secured to the valve and extending through the said guide,

and a stop adjustably secured on the stem and 5 adapted to impinge against the guide and thereby limit the movement of the valve.

5. In a carburetor, the combination with the carbureting chamber having oil and air inlets, of an outlet pipe for the explosive gas, an air vent in said outlet pipe, a slide on the outer side of said vent, a valve for the air inlet, and a valve on the inner side of said vent connected with the valve for the air inlet.

6. The combination with the carbureting chamber, of a hollow plug extending through the top of the same and having a tapered opening in its lower end, a valve resting normally in said opening, and a centrally perforated collar secured in the plug above the valve and constructed to limit the movement of the same. 7 v r c 7.- The combination with the carbureting chamber, of a hollow plug extending into'the top of the same, a valve locatedwithin the plug, a screen arranged transversely within the plug, a cap secured to the end of the plug and bearing on the screen to hold the same in place, and a perforated collar within the plug acting as a stop for the valve.

8. In a carburetor, the combination with the carbureting chamberhaving oil and air inlets and a gas outlet, of a valve in the oil inlet, a valve in the air inlet constructed to operate the oil inlet valve, a valve stem depending from the air inlet valve, a guide through which said stem passes, an adjustable collar supported by the lower end of the guide, means for adjusting said collar, and a stop on the valve stem constructed to impinge against said collar. I

In testimony whereof I affixiny signature in 7 presence of two witnesses.

'ROLF J. ROLFSON;

WVitnesses:

N. A. AGKER, F. E. MoNTEvERDE. 

